| I | harden |
| you | harden |
| he/she/it | hardens |
| we | harden |
| you | harden |
| they | harden |
| I | have hardened |
| you | have hardened |
| he/she/it | has hardened |
| we | have hardened |
| you | have hardened |
| they | have hardened |
| I | hardened |
| you | hardened |
| he/she/it | hardened |
| we | hardened |
| you | hardened |
| they | hardened |
| I | had hardened |
| you | had hardened |
| he/she/it | had hardened |
| we | had hardened |
| you | had hardened |
| they | had hardened |
| I | will harden |
| you | will harden |
| he/she/it | will harden |
| we | will harden |
| you | will harden |
| they | will harden |
| I | will have hardened |
| you | will have hardened |
| he/she/it | will have hardened |
| we | will have hardened |
| you | will have hardened |
| they | will have hardened |
| I | am hardening |
| you | are hardening |
| he/she/it | is hardening |
| we | are hardening |
| you | are hardening |
| they | are hardening |
| I | have been hardening |
| you | have been hardening |
| he/she/it | has been hardening |
| we | have been hardening |
| you | have been hardening |
| they | have been hardening |
| I | was hardening |
| you | were hardening |
| he/she/it | was hardening |
| we | were hardening |
| you | were hardening |
| they | were hardening |
| I | had been hardening |
| you | had been hardening |
| he/she/it | had been hardening |
| we | had been hardening |
| you | had been hardening |
| they | had been hardening |
| I | will be hardening |
| you | will be hardening |
| he/she/it | will be hardening |
| we | will be hardening |
| you | will be hardening |
| they | will be hardening |
| I | will have been hardening |
| you | will have been hardening |
| he/she/it | will have been hardening |
| we | will have been hardening |
| you | will have been hardening |
| they | will have been hardening |
| I | would harden |
| you | would harden |
| he/she/it | would harden |
| we | would harden |
| you | would harden |
| they | would harden |
| I | would have hardened |
| you | would have hardened |
| he/she/it | would have hardened |
| we | would have hardened |
| you | would have hardened |
| they | would have hardened |
| I | would be hardening |
| you | would be hardening |
| he/she/it | would be hardening |
| we | would be hardening |
| you | would be hardening |
| they | would be hardening |
| I | would have been hardening |
| you | would have been hardening |
| he/she/it | would have been hardening |
| we | would have been hardening |
| you | would have been hardening |
| they | would have been hardening |
| You | harden |
| we | Let's harden |
| You | harden |